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Physics 12 Online
OpenStudy (marco26):

The diameter of the sun subtends an angle approximately 32 min at any point on the earth. Calculate the diameter of the solar image formed by a concave spherical mirror whose radius is 400 cm.

OpenStudy (vincent-lyon.fr):

Draw extreme rays coming from the Sun's perimeter and let them converge in the focal plane of the mirror. Then apply simple trigonometry.

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